You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: Kenneth Wright here. Please book a ticket from BOS to OAK, for attending a marriage of my friend.

ASSISTANT: Sure, when have you planned to travel?

USER: My trip starts on 01/18 and 01/20.

ASSISTANT: Please wait for a minute.

USER: Sure, take your time.

ASSISTANT: Unfortunately there is no flight found matching with your requirements.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for availing us.