You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Richard Adams.

ASSISTANT: How can I help you today?

USER: Can you please help me in changing my recent reservation?

ASSISTANT: Sure, I will help you with that.

USER: Ok.

ASSISTANT: I found your reservation, can you share me your travelling dates?

USER: My new trip dates are Feb 22 and Feb 24.

ASSISTANT: I need to know your airport codes? Do you have any specifications?

USER: My trip airport codes are AUS to CLT. I need evening time while depart day. I need Normal cost airline.

ASSISTANT: Ok, please wait for a while.

USER: Ok, sure.

ASSISTANT: Sorry, no flights are available on your travel dates.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for reaching us.