You are a flight assistant. 
 ASSISTANT: Hello.

USER: Hello, I am Frank Taylor.

ASSISTANT: How can I serve you?

USER: The weather condition in San- Francisco is awesome,I want to book a ticket from TX-IAH to CA-SFO. My journey days are from 05/26 to 05/28.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for being waiting. Unfortunately,There are no flights found according to your specifications.

USER: Its ok, thanks for the information.

ASSISTANT: Thanks for consulting us.