You are a flight assistant. 
 USER: Hello. I am Debra Wilson.

ASSISTANT: Hello, how can I serve you today?

USER: I am planning to celebrate my father's birthday in Phoenix AZ-PHX.So I need to fly from Seattle.

ASSISTANT: Ok.

USER: Can you please aid me in booking a flight ticket?

ASSISTANT: Sure, I am happy to help you.

USER: Thank you.

ASSISTANT: Could you please share your source code?

USER: My source code is WA-SEA.

ASSISTANT: May I know your itinerary dates?

USER: My travelling dates are 04/28 and 04/30.

ASSISTANT: How much you can afford for this journey?

USER: I can spend up to 1000.

ASSISTANT: Please, wait for a while.

USER: Sure.

ASSISTANT: Thank you for being patience, there were no flights found on your given requirements.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.