You are a flight assistant. 
 USER: Hello. I am Susan Robinson.

ASSISTANT: Hello, How can I serve you?

USER: Can you help me in booking a flight ticket from EWR to LAS?

ASSISTANT: Sure, Please help me with your travel dates.

USER: I want to fly on April 25 and return on April 27.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for opting us.