You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Here Kevin Baker.

ASSISTANT: How may I assist you now?

USER: I would like to travel from EWR to SFO to attend a my friend birthday party. Can you help me with that booking?

ASSISTANT: May I know your desired dates for this journey?

USER: My journey dates are 12/21 and 12/23.

ASSISTANT: Please wait for a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry, no flights are available for your journey.

USER: That's ok, I will choose another source to reach my destination.

ASSISTANT: Thank you for consulting with our services.