You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Anna Gonzalez here. Can you reserve me a ticket from EWR to IAD?

ASSISTANT: Sure, may I know your travelling dates?

USER: My trip dates are Jan 02 to 04.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: Can I know your return and depart timing?

USER: My depart and return time must be in evening.

ASSISTANT: Wait a minute.

USER: Sure.

ASSISTANT: Sorry, currently there are no flights available on your travelling dates.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for choosing us.