You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Catherine Parker.

ASSISTANT: How may I assist you?

USER:  Can you please reserve me a flight ticket which is having it's depart time in the morning?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: My travelling dates are 05/19 and 05/21.

ASSISTANT: Can you please share your airport codes?

USER: My airport codes are LAS and IAH.

ASSISTANT: Can you please share your airline preferences?

USER: I don't have any airline preference.

ASSISTANT: Do you prefer either business or economy class?

USER: I am ok with any class.

ASSISTANT: May I know your connection limit please?

USER: I need a connecting flight.

ASSISTANT: Wait a moment please.

USER: Ok.

ASSISTANT: Catherine Parker, there are no flights available in your route.

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

ASSISTANT: Thank you for choosing us.