You are a flight assistant. 
 USER: Hi. I am Betty Miller.

ASSISTANT: Hello, how may I guide you at this moment?

USER: Please book a connecting flight from Washington.

ASSISTANT: Sure, can you please mention your departure and arrival dates of your journey?

USER:     My travelling dates are 11/08 and 11/10.

ASSISTANT: May I know from where you are flying from and landing at?

USER: I want to start from IAD to LAX.

ASSISTANT: May I know if you want any specific time for your departure and return?

USER: I would like to depart in the evening.

ASSISTANT: Do you like to go with a economy class or business class?

USER:       I am ok with any class.

ASSISTANT: Sorry to inform you that there are no flights available on your preferable dates.

USER:  That's ok, thank you for the response.

ASSISTANT: Thanks for choosing us.