You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Melissa Mitchell.

ASSISTANT: What service that you are looking from our agency?

USER: Could you please help me in flight ticket booking process from DEN to OAK?

ASSISTANT: Sure, I am gleeful to help you with that. Can you please provide your preferable dates of travelling?

USER: Thank you for your response, I would like to take off on Oct 24 and book my return ticket also on Oct 26.

ASSISTANT: Which class do you prefer either economy or business?

USER: I am ok with any class.

ASSISTANT: Is there any specific timings in your departure and arrival?

USER: I want to return in morning time so please check with this.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need 1 break in between my journey.

ASSISTANT: Please be on hold to check the flights.

USER: Ok.

ASSISTANT: Unfortunately there are no flights running on your route with your required preferences.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Thank you for using our services.