You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How may I help you?

USER: I am planning to go for a phoenix hot air balloon ride in Phoenix, PHX on coming weekend. Can you please help me with reservation?

ASSISTANT: Ok.

USER: Thanks.

ASSISTANT: Please provide your journey dates in order to book a ticket.

USER: 04/28 and 04/30 are my planned journey dates.

ASSISTANT: Please mention boarding airport code?

USER: Oakland, CA - OAK is my boarding point.

ASSISTANT: Please let me know your name?

USER: Scott Robinson is my name.

ASSISTANT: Ok. No flight is available.

USER: Ok, No problem. Thanks for the response.

ASSISTANT: Thanks.