You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am planning to go Boston to celebrate my brother birthday. Can you help me to book a flight ticket?

ASSISTANT: Sure, please share me your travelling dates?

USER: Dates are 03/05 and 03/07.

ASSISTANT: Can I know your airport codes?

USER: My airport codes are SEA-BOS.

ASSISTANT: Please mention your name name?

USER: David Garcia here.

ASSISTANT: Sorry, to inform you that there is no reservation with your name.

USER: No issue, Thank you.

ASSISTANT: Thank you.