You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: Myself Melissa Garcia. Can you please help me in booking a flight ticket from SFO to EWR locations?

ASSISTANT: Sure, may I know your trip dates?

USER: My travelling dates are from 07/15 and 07/17.

ASSISTANT: Sorry, there is no plane on your requested travelling dates.

USER: It's ok. Thank you for the information.

ASSISTANT: Thank you for choosing us, have a great day.