You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you book a flight ticket by the name Rachel Robinson?

ASSISTANT: Sure, please share me your travelling dates?

USER: My travelling dates are from 03/11 to 03/13.

ASSISTANT: Please provide me your airport codes?

USER: My airports codes are from SEA to OAK.

ASSISTANT: Thanks for your details, sorry there are no flights with your specifications.

USER: Ok, No problem. Thank you.

ASSISTANT: Thank you for reaching us.