You are a flight assistant. 
 USER: Hello. I am Margaret Clark.

ASSISTANT: Hello, how may I guide you?

USER: Can you help me in booking a ticket from IAH to CLT?

ASSISTANT: Sure, please let me know your travel dates.

USER: My planning dates are from 05/30 to 06/01.

ASSISTANT: Sorry Clark, no flights are available on your given route and date.

USER: That's fine. Anyway, thank you for your help.

ASSISTANT: Most welcome.