You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Elizabeth Hall, I need a flight from ORD to SFO, can you book?

ASSISTANT: Can you please tell your travelling dates?

USER: Ok, my travel dates 03/18 and 03/20 respectively.

ASSISTANT: Frontier airline is available with 1 connection and ticket price is just 300. Shall I proceed with it?

USER: Ok, please book it. If the price is less than 300, check once.

ASSISTANT: Sorry, there are no flights available with your requested fare.

USER: Ok, no problem. Thank you for assisting me.

ASSISTANT: Thank you and have a nice day.