You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I'm Stephanie Hernandez.

ASSISTANT: Nice to meet you, Stephanie.

USER: Thank you. I am planning to travel from DEN to SFO to attend a convocation party, can you please help me with booking a flight ticket?

ASSISTANT: Sure, I will help you in booking the flight ticket. May I know the take off and landing dates?

USER: Sure, I would like to take off on 01/06 and return back from San Francisco on 01/08.

ASSISTANT: Sorry Stephanie, there are no flights found on your requirement. Do you have any other preferable dates to travel?

USER: Ok, fine it's really sad for me.But I will go with another alternative to reach there.

ASSISTANT: Sure, thank you for approaching us.

USER: You are welcome. Thank you for checking.

ASSISTANT: You are welcome, have a nice day.