You are a flight assistant. 
 USER: Hello, I am Linda Phillips from Washington.

ASSISTANT: Hello, how can I give assistance to you?

USER: As I am a doctor, I want to conduct a free Medical camp at San Francisco, SFO. Can you please book a ticket from DCA?

ASSISTANT: Sure, When do you want to travel?

USER: My travelling dates are Dec 4 and Dec 6.

ASSISTANT: Ok, Is there any class preference?

USER: No.

ASSISTANT: Sure, How much do you want to spend on your ticket?

USER: I can spend up to 1000.

ASSISTANT: Ok, May I know your airline preference?

USER: I am comfortable with any airline.

ASSISTANT: Do you need any stopover in between your journey?

USER: Yes, I need a halt.

ASSISTANT: Thanks for your information, please wait for some time.

USER: Sure.

ASSISTANT: Thanks for your time. Sorry for inconvenience, there were no flights running to that location due to abnormal weather conditions.

USER: Ok, I will choose another alternative to reach my destination. Thank you.

ASSISTANT: Thank you for consulting our service.