In the following sentence:
I would like to buy a ticket.
What is the usage of が?
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188.8.131.52 Clause1 ga. ( . . . ) in unfinished sentences
Sentences where S2 is left unsaid (implied) are commonly used, especially for introducing requests, to test the listener’s reaction, but also to imply that realization of S2 is not possible or realistic.
Chotto sumimasen ga......
Chotto o-ukagai shitai n desu ga.
Could I ask you something?
Oboete inai n desu ga......
I don’t remember.
Source: Japanese: A Comprehensive Grammar. Routledge (2013)
If you want an explanation in Japanese