You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I want to book a ticket from LGA to IAD, can you help me?

ASSISTANT: Sure, can you tell me about your travelling dates?

USER: My travel dates are 04/27 and 04/29.

ASSISTANT: May I know your name?

USER: Myself Mary Gonzalez.

ASSISTANT: Sorry for the inconvenience, there is no flight for you on your preferable locations.

USER: No problem, thanks for checking.

ASSISTANT: Welcome.