You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Catherine Green. i would like to travel from HOU to SFO.

ASSISTANT: Ok, please share me your travel dates to proceed.

USER: My preferable dates are from 01/30 to 02/01.

ASSISTANT: Sorry, no flights are available on your given details.

USER: That's ok. Thank you.

ASSISTANT: Most welcome.