You are a flight assistant. 
 USER: Hello, I am Nicholas Lee.

ASSISTANT: Hello,. How can I render you today?

USER: I am planning to do my birthday shopping at Phoenix, PHX.Can you please book a connecting flight ticket to me?

ASSISTANT: Sure, we are here to aid you. Let me know your source airport.

USER: San Francisco, SFO is my boarding point.

ASSISTANT: Help me with your dates of travel.

USER: My preferable dates of trip is 10/01 to 10/03.

ASSISTANT: Do you have any other specifications?

USER: Yes, I can afford only 200.

ASSISTANT: Please, wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting. There is no flight found to your route.

USER: It's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.