You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I would like to travel from SFO to DCA as a holiday trip. Can you do the reservation?

ASSISTANT: Sure, I am here to help.

USER: Thank you.

ASSISTANT: Please share your planned travel dates to proceed further.

USER: My trip dates are 12/15 and 12/17.

ASSISTANT: Do you prefer either economy or business class?

USER: I am comfortable with any class.

ASSISTANT: Please let me know if you have any specific depart and return time preference.

USER: Departure and return time should be morning.

ASSISTANT: May I know your name please?

USER: Jack Perez here.

ASSISTANT: Sorry, we don't have any flight available on given dates.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for reaching us.