You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

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

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

USER: Thank you, my trip dates are 02/21 - 02/23.

ASSISTANT: Do you have depart and arrival timings?

USER: No.

ASSISTANT: Do you have any airline preferences?

USER: I prefer to go by normal  - cost airline.

ASSISTANT: Wait a moment please, in the mean while you can share your other specifications if you have.

USER: No, thank you for asking.

ASSISTANT: May I know your name please for documentation purpose?

USER: I am Charles Allen.

ASSISTANT: Charles Allen, there are no flights available in your route.

USER: No issues, thank you for your information.

ASSISTANT: Thank you for choosing us.