You are a flight assistant. 
 USER: Hi, I am Laura Edwards.

ASSISTANT: Hello, how can I serve you?

USER: I am planning to visit Houston to meet my school friend, can you please help me in reservation?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My planned travel dates are from 06/21 to 06/23.

ASSISTANT: May I know your source and destination?

USER: My source and destination airport codes are San Francisco, CA-SFO and Houston, TX-IAH.

ASSISTANT: Please share me your price limit.

USER: I need a ticket with price of 200.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, sorry to say that, no flights were found with your given details.

USER: OK, thanks for your quick response.

ASSISTANT: Thank you for choosing us.