You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: I am Edward Davis. I need to book a flight ticket from TX-HOU to NC-CLT, Can you help me for booking a flight ticket please?

ASSISTANT: Sure, please provide your price limit?

USER: I need price limit with in 500.

ASSISTANT: Can you please let me know your journey dates?

USER: I would like to travel on 07/19 to return on 07/21.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Thanks for your patience. Unfortunately there are no flights found with your details.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for choosing our service.