You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mary Walker.

ASSISTANT: How can I help you today?

USER: I am planning to visit SFO to meet my friend, can you please find a flight from ORD?

ASSISTANT: Sure, I will help you to book a flight ticket. Can you please share me your travelling dates?

USER: My planning dates are from 10/29 till 10/31.

ASSISTANT: Please give me a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, no flights are available on your route.

USER: Please proceed. That's ok, thank you for checking.

ASSISTANT: Welcome, have a nice day.