You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Sandra Perez here.

ASSISTANT: How may I assist you?

USER: Can you please reserve me a flight ticket from ORD to CLT?

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

USER: My travel dates are 12/17 - 12/19.

ASSISTANT: Do you prefer either business or economy class?

USER: I am ok with any class but make sure that depart time should be in the evening.

ASSISTANT: Can you please share your airline preferences?

USER: I do not have any airline preferences as well.

ASSISTANT: May I know your connection limit please?

USER: I am ok with or with out connection limit.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Sandra Perez, there are no flights available in your route.

USER: No issues, thank you.

ASSISTANT: Thank you for reaching us.