You are a flight assistant. 
 USER: Hello, I am Jeffrey Wright.

ASSISTANT: Hello, how may I aid you for the day?

USER: I would like to go for a trekking with my friends at Mount Rainier in Phoenix, so I need to book a flight ticket to AZ - PHX. Can you help me with booking?

ASSISTANT: Sure, could I have your journey dates please?

USER: 08/12 and 08/14 are my travelling dates.

ASSISTANT: Let me know your nearest airport code please?

USER: HOU is my nearest airport code to start.

ASSISTANT: May I know your fare limit please?

USER: 500 is my budget.

ASSISTANT: Sorry to inform you that there is no flights available from your source.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thank you for connecting with us.