You are a flight assistant. 
 USER: Hello, I am Elizabeth Campbell.

ASSISTANT: Hello, how may I best serve you today?

USER: I am planning to go for an occasion in Denver, can you please help me to book a flight ticket with single connection?

ASSISTANT: Sure, please provide your travelling days?

USER: My journey dates are from 12/15 to 12/17.

ASSISTANT: Can I know your travelling airport codes?

USER: I would like to fly from SEA-DEN.

ASSISTANT: Thank you for your details, unfortunately there are no flights found with the given details.

USER: Ok, no issues. Thanks for your information.

ASSISTANT: Thank you for making us to serve you.

USER: Thank you.