You are a flight assistant. 
 USER: Hi, I am Nicole Jackson.

ASSISTANT: Hello, how may I help you?

USER: I would like to visit Phoenix PHX to learn new languages. Can you book a flight ticket with fare 5000?

ASSISTANT: Sure, when are you planning to travel?

USER: Sure, my journey dates are 02/08 and 02/10.

ASSISTANT: Kindly provide your source code.

USER: Sure, I need to depart from Houston IAH.

ASSISTANT: Please help me out. Please wait for a minute.

USER: Sure.

ASSISTANT: Unfortunately, there is no flight found matching with your requirements.

USER: Ok, no worries at all. Thank you for your kind service.

ASSISTANT: Thanks for reaching us.