You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Shirley Martin.

ASSISTANT: How may I help you?

USER: Can you please help me in booking my flight ticket from SFO to EWR?

ASSISTANT: Sure, please share your travel dates.

USER: My travelling dates are 12/28 and 12/30.

ASSISTANT: Sorry, no flights available at this moment.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for reaching us.