You are a flight assistant. 
 USER: Hello, I am Gregory Perez.

ASSISTANT: Hello, how can I support you now?

USER: I want to book a ticket from 01/26 to 01/28. Can you please help me in booking a ticket?

ASSISTANT: Sure, please share me your airport code?

USER: My airport codes are from IAH to SFO.

ASSISTANT: Do you have any restriction on price limit?

USER: My price limit is 1000.

ASSISTANT: Please wait, while I search for a flight.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry to inform that there is no any flight available on your journey data.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for reaching us, have a nice day.