You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you for today?

USER: I am Donna Phillips from San Francisco. I have to go Denver next week, can you please book a flight ticket for me?

ASSISTANT: Yes, I am here to help you about that. Can you please provide your planned dates of journey?

USER: Thank you, I want to take off on 11/01 and book my return ticket also on 12/02.

ASSISTANT: Can you please provide your location codes of journey?

USER: I want to fly from SFO and destination airport is DEN.

ASSISTANT: Sorry Phillips, there is no flights on your planned dates of journey.

USER: Oh! It's ok no problem, I will go with another airline service. Thank you for your service.

ASSISTANT: My pleasure, thank you for reaching out here.