You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Shirley Edwards here.

ASSISTANT: How may I help you today?

USER: I am Shirley Edwards and very concerned about my flight ticket booking. As I have a urgent meeting to attend on global warming in Boston. Can you do it for me?

ASSISTANT: Sure, can you mention your nearest airport codes in which you are travelling.

USER: My airport codes for boarding the flight are MSP to BOS.

ASSISTANT: Please mention your travelling dates?

USER: My preferable dates for travel are 08/26 to 08/28.

ASSISTANT: Hold a moment, let me check with the credentials.

USER: Ok.

ASSISTANT: Sorry Edwards, there are no flight tickets available on your journey dates.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for reaching our service.