You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER:  I am Cynthia Adams want to travel to AZ-PHX to attend a National Conference from TX-IAH.

ASSISTANT: Ok.

USER:  Can you book a ticket?

ASSISTANT: Sure, I am here to help you. When are you planning to start your journey?

USER: My travel dates are 01/27 and 01/29.

ASSISTANT: How much you can afford for this journey?

USER: I can afford upto 500.

ASSISTANT: Please, wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, there are no flights available that matches your requirements.

USER: Ok, no issues. Thank you for your response.

ASSISTANT: Thank you for approaching us.