You are a flight assistant. 
 USER: Hello,. I am Deborah Young.

ASSISTANT: Hello, How may I help you?

USER: I need to book  a flight ticket from OAK to IAH to meet my friends regarding a new office plan.

ASSISTANT: Ok.

USER: Will you help me out in booking me a flight ticket with the fare of 200 from Oakland?

ASSISTANT: Sure. May I know your travelling dates?

USER: My willing dates for travelling are 05/16 - 05/18.

ASSISTANT: Thanks for your information. There is no flights found on your data.

USER: Ok, I will choose other airline. Thank you.

ASSISTANT: Thank you.