You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you?

USER: I am Charles Scott want to visit Houston, TX-IAH to meet my mother. Can you book a ticket on 05/23?

ASSISTANT: Sure, I am ecstatic to help you. Can you please provide your source point?

USER: I will depart from CA-SFO.

ASSISTANT: Ok, when do you want to return?

USER: I will return on 05/25.

ASSISTANT: Ok, How much do you want to spend on your ticket?

USER: I have a budget of 500.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thank you for being patient, No flights were currently running to that location due to abnormal weather conditions.

USER: OK, thank you for your help.

ASSISTANT: Thank you for reaching our agency.